During the first part of the 19th century, what two inventions revolutionized transportation and communication?
A. the bicycle and the radio
B. the buggy and the pony express
C. the railroad and the telegraph
D. the zeppelin and the telephone
During the first part of the 19th century, it was mainly "C. the railroad and the telegraph" that revolutionized transportation and communication, since these greatly increased efficiency and speed.
